From abdd85b6ba7322299d69ab68e1fc6849f6998492 Mon Sep 17 00:00:00 2001 From: Wendy Liang Date: Thu, 21 Feb 2019 16:36:34 -0800 Subject: dt-bindings: mailbox: Add Xilinx IPI Mailbox Xilinx ZynqMP IPI(Inter Processor Interrupt) is a hardware block in ZynqMP SoC used for the communication between various processor systems. Signed-off-by: Wendy Liang Reviewed-by: Rob Herring Signed-off-by: Jassi Brar --- .../bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt | 127 +++++++++++++++++++++ 1 file changed, 127 insertions(+) create mode 100644 Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt (limited to 'Documentation') diff --git a/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt new file mode 100644 index 000000000000..4438432bfe9b --- /dev/null +++ b/Documentation/devicetree/bindings/mailbox/xlnx,zynqmp-ipi-mailbox.txt @@ -0,0 +1,127 @@ +Xilinx IPI Mailbox Controller +======================================== + +The Xilinx IPI(Inter Processor Interrupt) mailbox controller is to manage +messaging between two Xilinx Zynq UltraScale+ MPSoC IPI agents. Each IPI +agent owns registers used for notification and buffers for message. + + +-------------------------------------+ + | Xilinx ZynqMP IPI Controller | + +-------------------------------------+ + +--------------------------------------------------+ +ATF | | + | | + | | + +--------------------------+ | + | | + | | + +--------------------------------------------------+ + +------------------------------------------+ + | +----------------+ +----------------+ | +Hardware | | IPI Agent | | IPI Buffers | | + | | Registers | | | | + | | | | | | + | +----------------+ +----------------+ | + | | + | Xilinx IPI Agent Block | + +------------------------------------------+ + + +Controller Device Node: +=========================== +Required properties: +-------------------- +IPI agent node: +- compatible: Shall be: "xlnx,zynqmp-ipi-mailbox" +- interrupt-parent: Phandle for the interrupt controller +- interrupts: Interrupt information corresponding to the + interrupt-names property. +- xlnx,ipi-id: local Xilinx IPI agent ID +- #address-cells: number of address cells of internal IPI mailbox nodes +- #size-cells: number of size cells of internal IPI mailbox nodes + +Internal IPI mailbox node: +- reg: IPI buffers address ranges +- reg-names: Names of the reg resources. It should have: + * local_request_region + - IPI request msg buffer written by local and read + by remote + * local_response_region + - IPI response msg buffer written by local and read + by remote + * remote_request_region + - IPI request msg buffer written by remote and read + by local + * remote_response_region + - IPI response msg buffer written by remote and read + by local +- #mbox-cells: Shall be 1. It contains: + * tx(0) or rx(1) channel +- xlnx,ipi-id: remote Xilinx IPI agent ID of which the mailbox is + connected to. + +Optional properties: +-------------------- +- method: The method of accessing the IPI agent registers. + Permitted values are: "smc" and "hvc". Default is + "smc". + +Client Device Node: +=========================== +Required properties: +-------------------- +- mboxes: Standard property to specify a mailbox + (See ./mailbox.txt) +- mbox-names: List of identifier strings for each mailbox + channel. + +Example: +=========================== + zynqmp_ipi { + compatible = "xlnx,zynqmp-ipi-mailbox"; + interrupt-parent = <&gic>; + interrupts = <0 29 4>; + xlnx,ipi-id = <0>; + #address-cells = <1>; + #size-cells = <1>; + ranges; + + /* APU<->RPU0 IPI mailbox controller */ + ipi_mailbox_rpu0: mailbox@ff90400 { + reg = <0xff990400 0x20>, + <0xff990420 0x20>, + <0xff990080 0x20>, + <0xff9900a0 0x20>; + reg-names = "local_request_region", + "local_response_region", + "remote_request_region", + "remote_response_region"; + #mbox-cells = <1>; + xlnx,ipi-id = <1>; + }; + /* APU<->RPU1 IPI mailbox controller */ + ipi_mailbox_rpu1: mailbox@ff990440 { + reg = <0xff990440 0x20>, + <0xff990460 0x20>, + <0xff990280 0x20>, + <0xff9902a0 0x20>; + reg-names = "local_request_region", + "local_response_region", + "remote_request_region", + "remote_response_region"; + #mbox-cells = <1>; + xlnx,ipi-id = <2>; + }; + }; + rpu0 { + ... + mboxes = <&ipi_mailbox_rpu0 0>, + <&ipi_mailbox_rpu0 1>; + mbox-names = "tx", "rx"; + }; + rpu1 { + ... + mboxes = <&ipi_mailbox_rpu1 0>, + <&ipi_mailbox_rpu1 1>; + mbox-names = "tx", "rx"; + }; -- cgit v1.2.3-59-g8ed1b